Received: 1 February 2019
Accepted: 16 August 2019
First Online: 11 November 2019
Ethics approval and consent to participate
: Ethical approval was obtained from the Ethics Review Board of the School of Pharmacy, Addis Ababa University with reference number ERB/SOP/57/11/2015.
: Not applicable since there is no individual details in our result.
: The authors declare that they have no competing interests.